<template>
  <div class="wrapper">
    <!-- header部分 -->
    <header>
      <p>商家列表</p>
    </header>
    <!-- 返回按钮 -->
    <div class="back-button" @click="goBack">
      <i class="fa fa-arrow-left"></i>
      <!-- 使用 Font Awesome 图标 -->
    </div>
    <!-- 商家列表部分 -->
    <ul class="business">
      <li v-for="item in businessList" :key="item.businessId" @click="toBusinessInfo(item.businessId)">
        <div class="business-img">
          <img :src="item.businessImg" />
          <div v-if="item.count > 0" class="business-img-quantity">{{ item.count }}</div>
        </div>
        <div class="business-info">
          <h3>{{ item.businessName }}</h3>
          <p>&#165;{{ item.starPrice }}起送 | &#165;{{ item.deliveryPrice }}配送</p>
          <p>{{ item.businessExplain }}</p>
        </div>
      </li>
    </ul>
  </div>
</template>

<script>
import { showDialog } from 'vant';

export default {
  data() {
    return {
      typeId: this.$route.query.typeId,
      businessList: [],
      user: JSON.parse(sessionStorage.getItem("user")), //当前登录的用户信息
    }
  },
  methods: {
    // 返回上一页
    goBack() {
      this.$router.go(-1);
    },
    //点击某个商家
    toBusinessInfo(businessId) {
      this.$router.push({
        path: "/businessInfo",
        query: { businessId: businessId }
      });
    },
    //统计用户在商家中的购物车数量
    async cartCount() {
      await this.$http.get("/cart/cartBusinessCount", {
        params: {
          userId: this.user.userId
        }
      })
        .then(res => {
          let cartCountList = res.data.object
          for (let i = 0; i < this.businessList.length; i++) {
            for (let j = 0; j < cartCountList.length; j++) {
              if (cartCountList[j].businessId == this.businessList[i].businessId) {
                this.businessList[i].count = cartCountList[j].carcount
                break
              }
            }
          }
        })
    },
    //根据type查询商家列表信息
    async getBusinessList() {
      //   alert("根据type查询商家列表信息" + this.typeId);
      await this.$http.get('/business/listBusinessByType', {
        params: {
          typeId: this.typeId
        }
      })
        .then(res => {
          // console.log(res)
          this.businessList = res.data.object
          for (let i = 0; i < this.businessList.length; i++) {
            this.businessList[i].count = 0
          }
          //统计用户在商家中的购物车数量
          this.cartCount()
        })
    }
  },
  mounted() {

    if (this.typeId >= 0) {
      // 由主页直接进入
      this.getBusinessList();

    }
    else if (this.typeId == undefined) {
      this.businessList = JSON.parse(this.$route.query.BusinessList)
      // console.log(this.listBusiness)
    }

    else {
      showDialog({
          message: '全都不是',
        })
    }
  }
};
</script>

<style scoped>
/****************** 总容器 ******************/
.wrapper {
  width: 100%;
  height: 100%;
}

/****************** header部分 ******************/
.wrapper header {
  width: 100%;
  height: 12vw;
  background-color: #0097ff;
  color: #fff;
  font-size: 4.8vw;

  position: fixed;
  left: 0;
  top: 0;
  z-index: 1000;

  display: flex;
  justify-content: center;
  align-items: center;
}

/****************** 商家列表部分 ******************/
.wrapper .business {
  width: 100%;
  margin-top: 12vw;
  padding-bottom: 14vw;
}

.wrapper .business li {
  width: 100%;
  box-sizing: border-box;
  padding: 2.5vw;
  border-bottom: solid 1px #ddd;
  user-select: none;
  cursor: pointer;

  display: flex;
  align-items: center;
}

.wrapper .business li .business-img {
  /*这里设置为相当定位，成为business-img-quantity元素的父元素*/
  position: relative;
}

.wrapper .business li .business-img img {
  width: 20vw;
  height: 20vw;
}

.wrapper .business li .business-img .business-img-quantity {
  width: 5vw;
  height: 5vw;
  background-color: red;
  color: #fff;
  font-size: 3.6vw;
  border-radius: 2.5vw;

  display: flex;
  justify-content: center;
  align-items: center;

  /*设置成绝对定位，不占文档流空间*/
  position: absolute;
  right: -1.5vw;
  top: -1.5vw;
}

.wrapper .business li .business-info {
  margin-left: 3vw;
}

.wrapper .business li .business-info h3 {
  font-size: 3.8vw;
  color: #555;
}

.wrapper .business li .business-info p {
  font-size: 3vw;
  color: #888;
  margin-top: 2vw;
}

.back-button {
  position: fixed;
  top: 5vw;
  /* 根据需要调整高度 */
  left: 4vw;
  /* 给左边留出一定间距 */
  display: flex;
  align-items: center;
  cursor: pointer;
  color: #ffffff;
  font-size: 4vw;
  z-index: 1000;
}
</style>
